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Both Colonial and UNSC Marines are en route to battle via dropship, ready to rock.

Sergeant Apone from Aliens (left) and Sergeant Johnson, as he appears in Halo 3 (right).

The UNSCMarines in Halo: Combat Evolved bear several resemblances to the Colonial Marines from Aliens in terms of armor design and behavior (characteristics and personality). It is evident that Bungie clearly loved them and fashioned their own closely after them.

Both Sergeant Apone and Sergeant Johnson have a strikingly similar appearance. Both are tough-as-nails, gung-ho Sergeants with a penchant for playfully mocking their Marines and spouting humorous one-liners, and Johnson occasionally repeats Apone's lines. Bungie even admitted that Sergeant Johnson was inspired from Sergeant Apone.[citation needed]

The Colonial Marines' main weapon, the M41A Pulse Rifle, is equipped with a digital ammo counter and fires caseless ammunition. Similarly, the UNSC Marines' main rifles have digital ammo counters. Marines in both series have Helmet recorders.

A comparison between the infected from the Aliens and Halo franchises.

Notice the similarities between the Facehugger and the Infection Form. Both are roughly the size of a football, their coloring is extremely similar, neither has visible eyes or mouths, both move around low to the ground on numerous long, thin appendages, and both have a ridged tail. Both are able to leap with appendages spread open in order to latch on to their soon-to-be-hosts.

When a Facehugger attaches to a host, it implants a Xenomorph embryo, which will eventually become a "Chestburster" and smash its way out of the victim. This tiny Xenomorph will grow very quickly into either a Warrior or a Queen. When the Flood attaches to a host, it will mutate and take over the host, transforming it into a Flood warrior (if adequate biomass is present). In the case of both aliens, the genetic make-up of the host will influence the genetic make-up of the resulting creature "born" from the parasitic process. For example, if a Xenomorph hatches from a human, it will adopt human characteristics, and if a Flood attaches to a human, it will retain the human host's characteristics.

The robot Ash describes the alien in the franchise's first film as "the perfect organism," while the Gravemind (as well as the artificial construct 032 Mendicant Bias) considers the Flood to be the perfect society—the last, most advanced stage of evolution. The "societies" of both species are governed by queen-bee-like leaders of a central hive-mind. In both societies, there appear to be no internal divisions or opposing behaviors.

A comparison between the Queen and the Sangheili High Councilor's headdress.

The headdresses worn by Sangheili High Councilors closely resemble the Alien Queen's head, albeit smaller and narrower. In addition, both Halo's Covenant Empire and Aliens' titular species have caste systems. Whereas the Covenant's is based primarily on race and religion, the Aliens' is based on their different life stages and host species.

Several vehicles and structures within the Halo trilogy are inspired by the Alien franchise. One such example would be the Pelican dropship, which bears some resemblance in form and function to Aliens' UD4L Cheyenne dropship (shown in their descent to the surface of LV-426). The UD-4L has an armored personnel carrier loaded internally in its belly, and the Pelican is capable of holding various vehicles externally from under its tail-section. Both swoop in, drop the Marines off, and get out of Dodge.

In a cutscene from the Halo 3Campaign level The Ark, a Pelican snaps off its frigate and plummets toward the eponymous construct below in almost exactly the same fashion as the UD-4L, when it deployed from the Sulaco starship in Aliens. Also,the Pelican cockpit seats are similar to the UD-4L as one is in the front right and the other is in the back left. In addition, the UNSC Frigates, such as the Forward Unto Dawn, the In Amber Clad, and the Aegis Fate, greatly resemble Sulaco, both in appearance and usage. The most obvious shared trait is that both of their profiles look like massive guns, a characteristic that the Sulaco is famous for.

In Aliens' fiction, "atmosphere processors" (above left and right) are set up by colonists in order to alter the atmosphere on new worlds, making them survivable by humans. This structure is prominent in the story, as it is the place where the colonists are cocooned and the Colonial Marines have their first "close encounter" with the Xenomorphs. The ForerunnerPortal to the Ark is also a prominent set piece in Halo 3. The name and concept of the Atmosphere Processor is also similar to "Atmospheric Processors" used to terraform worlds in the Halo universe.

Bumblebee Pilot: Heads up everyone, this is it. We’re entering the ring's atmosphere in five...

Notice the similarity between the three conversations below, the former being from Aliens and the latter two appearing in Halo: Combat Evolved. In particular, note the jargon that appears in all three.

Hicks: Ferro, do you copy?

Ferro: Standing by.

Hicks: Prep for dust off. We’re gonna need immediate evac.

Ferro: Roger. On our way.

Gorman:(to Ferro) Immediate dust off on my clear, then stay on station.

The light blue poster reads, "LOST: CALICO CAT ANSWERS TO: Jonesey," which alludes to a scene in Alien (the movie before Aliens) when Brett goes looking for the ship cat Jones by calling "Jonesy." However the Jonesy in Alien was not a calico.

Aliens' Ripley begins and ends two of the franchise's movies in cryo-stasis, much like John's beginning in Halo: Combat Evolved and ending in Halo 3. Both Ripley and John-117 begin their respective franchises in a large ship with other people, and both end up alone in a smaller shuttle with a non-human (Ripley with Jonesey and John with Cortana). Both characters also seem to be a rarity, in that they can survive encounters with the Xenomorphs and Flood, respectively.